Piston-packing.



No. 739,721. E1 F. 'P'. ROBERTS. PISTQNV PACKING.

APPLICATION IILIBD MAY 13,1902.

H0 MODEL.

PATENTED SEPT. 22. 1903.

Y able others skilled inthe art to which it my f'atented September 22, 1903.

PATENT OFFICE.

EDYVARD F. F.'ROBERTS, OF BALTIMORE, MARYLAND.

PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 739,721, dated September 22, 1903. Application filed May 13, 1902. Serial No. 107,082. (No model.) v

To all whom it may concern:

Beit known that I, EDWARD F. F. ROBERTS, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Piston-Packing; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enpertains to make and use the same.

My invention relates to the class of pistonpacking called metallic piston -packing, and is used for steam, air, and other engines, as well as pumps of all kinds.

. The object of the invention is to produce a metallic piston-packing that is more efiective in making the pistons for difierent kinds of engines, pumps, Si e, tighter in the cylinder, thereby preventing leakage of steam, air, water, oil, or other liquids and causing a better result in operation than any other kinds of piston-packing known to me 5 also, to prevent any leakage at the joints of the split rings; furthermore, that it will prevent the binding often occurring in engines and caused usually by expanding the packing-rings by steam or other pressure employed, or by setting them out with set-screws, often employed too hard against the inner surface or bore of the cylinder.

Another object is to produce a filling-piece for the joints that will not get loose or fall out of its place after the packing-rings have been worn down to a certain extent, as is the case with those now in use; furthermore, to greatly relieve the lower part of the cylinder for horizontal engines of the bull-ring usually employed and causing the wearing out of the cylinder, necessitating reboring of the same, and finally to facilitate the manufacture of the piston by its simplicity to increase its durability and to reduce its cost.

With these objects in view my invention consists in the peculiar construction of certain parts and the combination of parts, as will be more fully described hereinafter and specifically pointed out in the claims, reference being had to the accompanying drawings, and the letters marked thereon.

Like letters indicate similar parts in the different figures of the drawings,-in which- Figure 1 represents a face view of my improved piston and packing. Fig. 2 is a side view of the same. Fig. 3 is a vertical section on line so a? of Fig. 2. Fig. i is a side view of the packing-ring, showing the seat for the filling-piece. Fig. 5 is a detail view of the filling-piece employed.

.In the drawings, A represents the main ring of the piston, having three groovesb c (1 turned in it for-the reception of the packing-ringsB O D, the middle one, B, of which is plain and split,asshownatb. Thisringissetoutagainst the bore of the cylinder by a circular steel spring E or its equivalent. In the other grooves are placed the rings 0 and D, which are also split and are set out by their own elasticity. Where these two rings are cut and forming the joints thereof are arranged the filling-pieces H, that are provided with small flanges h which fit into a groove '5 in the packing-rings C and D and are held in place by a small pin 0,, thus preventing them from falling out of their places and causing damage thereby. The packing-rings G and D are in cross-section of L shape, as bestseen in Fig. 3, and thus allowing steam to enter under the horizontal part and assisting in setting them out against the bore of the cylinder in addition to their own elasticity.

If desired, the central ring B may be set out to the bore by steam admitted behind said ring from the cylinder through small holes k. (Shown in dotted lines.) I, however, prefer the circular spring for setting the ring out, as the pressure can be more easily regulated by it than the steam-pressure as it may be so high that the piston can be prevented from moving,

Having thus described my invention, what 1 claim, and desire to secure by Letters Patent, is-

1. In a piston-packing, the combination of a main ring, three recesses upon the periphery thereof, a packing-ring B and an expanding-spring E, placed in the central recess,'and L-shaped packing-rings placed in the two outer recesses and an L-shaped filling-piece H, at the joints of said outer rings, substaning flanges h fitting in said groove, as set tially as described. forth. :0

2. In a piston-packing substantially as de- In testimony whereof I hereby affix my sigscribed, a main ring'A, three parallel recesses nature in presence of two witnesses.

5 upon the periphery thereof, L-shaped pack EDWARD F. F. ROBERTS.

ing-rings filling the two outer recesses, said Witnesses: rings having abutting ends, groove 1' in one ASHER H. NOFSINGER, side of said ends, and filling-pieces H, hav- GEO. W. REA. 

